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  <dxl:Comment><![CDATA[
	Objective: For a DML query with a Union All containing an universal
	child ( 'select 1' in this case); the PhysicaUnionAll should request a
	Singleton Segment distribution spec instead of Singleton Master. 

	create table x(a int);
	create table y(b int);
	explain insert into y select 1 union all select a from x limit 10;
  ]]>
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                        <dxl:Column ColId="6" Attno="-5" ColName="xmax" TypeMdid="0.28.1.0" ColWidth="4"/>
                        <dxl:Column ColId="7" Attno="-6" ColName="cmax" TypeMdid="0.29.1.0" ColWidth="4"/>
                        <dxl:Column ColId="8" Attno="-7" ColName="tableoid" TypeMdid="0.26.1.0" ColWidth="4"/>
                        <dxl:Column ColId="9" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
                      </dxl:Columns>
                    </dxl:TableDescriptor>
                  </dxl:TableScan>
                </dxl:GatherMotion>
              </dxl:Append>
              <dxl:LimitCount>
                <dxl:ConstValue TypeMdid="0.20.1.0" Value="10"/>
              </dxl:LimitCount>
              <dxl:LimitOffset>
                <dxl:ConstValue TypeMdid="0.20.1.0" Value="0"/>
              </dxl:LimitOffset>
            </dxl:Limit>
          </dxl:Result>
        </dxl:RedistributeMotion>
      </dxl:DMLInsert>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
